On recent revisions the stuttering can be fixed with OpenAL... Since you're in a tablet, and SSBM is a lightweight game, I suggest trying r6515: you won't get suport in the forums, but it could provide a speedup in your tablet, because older versions are less accurate, so, they're less demanding...
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)